<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item"></span>
  </div>
</template>

<script type="text/ecmascript-6">
const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';

export default{
  props:{
    size:{
      type:Number
    },
    score:{
      type:Number
    }
  },
  computed:{
    starType(){
      return 'star-' + this.size
    },
    itemClasses() {
      let result = [];
      let score = Math.floor(this.score * 2) / 2;
      let hasDecimal = score % 1 !== 0;
      let integer = Math.floor(score);
      for(let i = 0;i<integer;i++){
        result.push(CLS_ON);
      }
      if(hasDecimal){
        result.push(CLS_HALF);
      }
      while(result.length < LENGTH){
        result.push(CLS_OFF);
      }
      return result;
    }
  }
}
</script>

<style lang="stylus" type="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl";

  .star
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &.last-child
          margin-right 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')    
    &.star-36
     .star-item
        width 15px
        height 15px
        margin-right 16px
        background-size 15px 15px
        &.last-child
          margin-right 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')    
    &.star-24
     .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &.last-child
          margin-right 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')    
</style>